The other day I was successfully able to get reSIProcate and the basicClient example program to run on my Raspberry Pi 2 under Windows 10 IOT Core! Very few changes were required to the stack in order to get it to compile as an ARM target. I will be moving these changes into the public GIT repository soon.

Raspberry Pi and Windows 10 IOT support USB speakers and microphones and the board itself has an audio jack, but it would be nice if Microsoft / Cirrus Logic would support the Cirrus Logic Audio Card daughter board for the Raspberry Pi 2 under Windows 10 IOT. This should prove to be a pretty good platform for embedded VoIP / windows based development.